Apparatus for delivering abrasive material.



J. W. CRUIKSHANK.

APPARATUS FOR DELIVERING ABRASIVE MATERIAL.

APPLICATION FILED mum, 1913.

1,089,909. Patented Mar.10,1914.

2 SHEETS-SHBET 1.

WITNESSES.

J. W. CRUIKSHANK.

APPARATUS FOR DELIVERING ABRASIVE MATERIAL.

APPLIGATION FILED JUNE 4. 1913v Patented Mar. 10, 1914 2 SHEETS-SHEET 2.

WITNESSES.- Z74.

JAMES W. CRUIKSHA NK. OF PITTSBURGH, PENNSYLVANIA.

APPARATUS F01. DELIVERING ABRASIVE MATERIAL.

Specification of Letters Patent.- Application filed June 4, 1913. Serial No. 771,639.

. PatentedMar. 10,1914.

To all whom it may concern:

Be it known that I, JAMES W. CrumsHAN r, a citizen of the United States, residingat Pittsburgh, in thecounty of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Apparatus for Delivering Abra-- sive Material, ofwhich the follow ng is a;

specification.

My invention relates to the art of grind ing and polishing, plate glass and refers particularly to grading and classifying apparatus for the abrasive, so constructed as to' adapt it to the classification as to varying degrees of coarseness, with means for extracting the abrasive material in suspension from the classifying or settling cham hers, and supplying it to the grinding table in progressive grades as required in the process. The apparatus consists generally of a preliminary sump pit or well into which the abrasive and water from the grinding machine fl0ws,a secondary chamber or well into which the contents of thepreliminary well are pumped, and wherein the grading and settlin operations are performed, with means for ifting the abrasive in suspension from the several compartments within the secondary well, embodying air lift pumps so arranged as to deliver the abrasive as required to the grinding machine where it is of Fig. 1.

utilized, with means for collecting and returning the overflow to the preliminary well.

In .the drawings, illustrating one referred installation of the apparatus, igure 1 is a general plan view showing the usual plate glass grinding machine and my nary well and settling chambers, at right angles to the construction shown ,in' Fig. 2, an indicated by the'section line III. III.

In the drawings,-2 represents the rotating table of a plate glassgrinding and polishin machine of usual construction prowith theusnal rotatingbrunners 3, .3.

'A centrally arranged dist-r1 uting trough 4 having pivotally mounted spouts 6, 5 depending below suitable framework, is a apted to race V0 and distribute the abrasive point of materiahas it is delivered to the central d stributing trough, in-the same manner as disclosed in patent of Hachmeister, dated 'June 3, 1913, No. 1,063,434; The tabler2 is surrounded by'an annular surrounding'col- 5 .lecting trough or d1tch'6, from which-by chute or conduit 7 the surplus abrasive sand Water pass to a screen 8 interposed between the collecting ditch and the preliminary or sump pit 9. This pit operates tocollectiall of the surplus material, or any fresh'sand or abrasive which may be discharged to 1i through the screen 8, and isrovided with a dividing partition 10 exten 'ng part wa). toward the bottom. I

An air lift pum 11, of any suitable construction but pre erably of the type illustrated and described in my companion application filed'herewith, Serial No. 771,640,-

is located in the lower portion of the sump pit 9 beyond partition 10, from which an upwardly extending pipe 12 delivers the abrasive into the upper portion of the'second ary or grading pit 13. This'pitis prefer? ably provided with a vertical partition 14 Y extending downwardly from the top a portion of the distance toward the bottom, 'providing for a downward circulation toward the preliminary or initial grading chamber containing the first air lift pump for the coarser abrasive. Beyond partition "14 are rimilar partitions 15, 16, extendedupwardly from the bottom of the main pit, terminatin;'- at successively increasing distances there from, andpreferably above the lower edge of partition 14 thus providing additional supplemental abrasive collecting-"compartments 13", 13, similar to the "initialiahm; sive collecting compartme'ii 13, and'adapt ed to receive and collect ccessively finer grades .oLthe abrasive as it is discha-rg'ed thereinto the upwardly travelihg main current. 'Air'lift pumps 17 18, '19, similar ll, are,located in the lower por-, said compartments 133.13", 13. the upper portion of the main chamber 13 to pum tions 0 being rovided with an overflow pipe 20 pf limited cross sectional area passing to t e sewer 23, referably inclined toward any scharge. The preliminary or sump-pit 9 is also provided at its upper por-- tion with 21 leading into the upper 0 initial chamber 13' betweenan overflow pipe 22, leadingto sewer 23, and also at its upper portion, with is preferably of more slightly increased cross sectional area than pipe 20; -The several air, lift pumps are provided with the downwardly deflected-centrally dis posed water jet nozzles 24 communicating with. Watersupply pipes 25 having regulat- .ing valves 26 connected to the water supply main pipe 27. The pipw 25 are also preferably provided with stop cocks '26, which may be set so as to rovide for a constant and redetermined ow of water, irrespective o the opening of valves 26.

Air is supplied 'to the several air lifts by pipes 32,0onnected with any suitable source of pressure supply, and having the necessary controlling valves-not shown. The

several airlift conduits 17", 18., 19, areeonnected by a manifold or header 28,,from which a common conduit pipe 29 leads :0 downwardly for distribution of the water and abrasive to the middle main trough Upwardly above the connections to mam fold 28, and above connectionto pipe 12, each of the air lift pipes is provided w th supplemental vertical pipes 30, each having at-i'ts' upper end' aregulable'outlet valve 31 for-escape of air. a 'lheoperation is as follows: Pit 9'being filled with water and abrasive material in any suitable manner which settles to the bottom in a layer more or less deep and em.- bedding the airlift pump 11, air and water are supplied to the air lift by operationof -the necessary valves, "allowing suilicient 86' water to pass downwardly into the'tightly compacted abrasive through terminal 24, commingling and mixing the abrasive. The sand and water, together with the water from the pit, clue to the lifting action of the .40 air supply and the variation in specific gravity, will then pass upwardly throughlthe conduitpipe 12 andinto theupper portion.

of .the main grading tank 13 behind. the :partition 14. Said partition will cause the mixture to How downwardly until it reaches the lower end of the partition, when the surplus waterearrying in suspension some of 1 the lighter abrasive, will pass upwardly through the main. well 13'toward outlct 20 across the upper portion of partitions 15 and- 16. The coarser abrasive will settle into the bottom, of compartment 13, the next finer grades of material being'collccted in the succeeding "compartments 13, 13. 86 The first air lift pump l7'is then pilt into operation with a suitable supply of air and water so thatthe mixture of sand and water passing tothe grinding machine through the pipe 1T.head'er 28 and pipe 29 to the griiidas ing machine will be of the proper consistv [or the firs-stage of the grinding f 41s the s." l Watevpasses ofl f in periphery or t grinding table the surrennding dit h and-f-thenm backhardly lllia llgll S' to thesu up' pit 9" noaaeoe I whereit collects for removal to t he settling A compartment 13, as abovdesdiibed. During the operation of the pump-17; the stir plus water delivered by pipe 12 passes up- 'wardly through chamber 13, carrying with it the finer grades of sand, as stated, the mas terial deposited in each successive chamber" being progiressively finer, due to the decrease 'oforce of the upward current of water, on account of the progressively increasing area of the main chamber. Surplus water, practically free from abrasive, will thus pass off through the 'Qutletpipe 20 to the sewer, carrying with it any light, useless waste material. I Outlet pipe 20'is preferably of a fixed cross sectional area. so as to allow for only a certain amount of water to pass upwardly and out through it, the excess of water passing back intothe sump pit -9by means ofthe overflow pipefll, or 5 if preferred,. to the sewer or other suitable discharge. The overflow. ipe 21, asshown, is so located and arrange as to. providean outlet from the chhmber 13 at'a level just slightly above the sewer outlet 20, so thiat when the inner end pi ipe. 20 is submerged, the surplus water will pass out .throu 'h :pipe 21 back to sump pit ,9, It. will thus e seen that the area of the pipe 20 regulates the maximum upward currentv of water through the chamber 13, and ndpba're grains of sand can be carried up and,d'epo'sitcd injthe fine sand chambers 13,j13*,'but will be collected in the first chamber'ltlfi. After the operation (if-applying" thcoarse 'sand by means of the first'airlift pu p 1'1, I then utilize the fine sand that has' bcn de- "1 positedin the chamber 13", 'by-means of pump 18. In order to prevent a' change'of 1 condition and a tlisturban'ceof thequilib: '105 irium of the upward flow,-the pump 11 in a sump pit 9 is shut down,so that'the' delivery of sand andwater is stopped from the con-' duit pipe 12, and the sand-carried. back? by 4 the waterfrom the'g rinding machine is de; v.livcned throhgh screen B and wilhacumu' late in the pit :9, during the'operation of the -other pumps, surplus water passihgbfi'fmm sump pit 9 b overflow conduit 2:? to sewer 23. It will a so be obvious that if pump '18 were put into 0 eration before the How of water was out o from the supply pipe .12,

that there would be? a tendency to draw coarse sand over the partition-15 into division 13", but on;account offalllof the/.water; 0 {or this part of the operation being supplied through the i ozzle 24 offlth e-pump; the-re,- oimihe non ward tiow of water fromf the b ttom of"division 13f,derived from fdi'-.- vision 13 over partition l5, and oonse -'quc i itly no tendsey toearry arty coarse ma mm: overftl' ""'on' .i o lheillfi jwhich 4 etlierwisei'vohldbe 5e duelto a void, crea ed by. the action of the sec mplanti- A tter' 't-he'termiuationiof'the operation of pump 17 pump 18 is then put into use by turning on the air and water supplied by the controlling)valves, the water supply being regulated y the stop cook 26 set for a predetermined supply, so that the graded sand in pit 13* will be mixed with water in the proper proportion to obtain the con sistency required for this part of. the operation, the abrasive being furnished to the table by pipe 18" and the manifold connection to supply pipe 29, as described. After terminatin the use of pump 18, the same operation is repeated for supplying sand from the chamber 13, the necessary quantity of water and air supply being regulated to suit the conditions, the quality of the sand,'etc.

In lhe operation of each of the several pumps} the surplus air passing up with the water rises through extension pipe 30 and passes off through valve 31, set to allow a predetermined quantity of air to pass and escape, thus preventing any violent pulsation at the delivery end of pipe 29, enough pressure however being retained to assist in forcing the mixture of sand and water down the pipe 29 toward the grinding machine.

It will be understood that the abrasive is supplied at times in a consistency so thick and dense as to require a slight force of air pressure to prevent the pi e' from becoming choked. Heretofore, in ct or apparatus for the same general purpose, utilizing collecting hoppers or cones, the coarse sand hop or was apt to become filled u and to overtidw into the receptacles inten ed for the finer grades of sand. One of the objects of m invention is to provide an apparatus which will give not only practically constant sup ply, but constant grades'of rinding sand, while any oversupply is reifiered impossible, the flow being so regulated to a init atimum amount, avoiding any surplus suppl of coarse or other abrasive. Even thougi any one or all of the several collecting receptacles may become filled up with their respective grades, no bad results will follow, and any unused surplus matter will fall back into the first or coarse sand pit.

A further im ortant advantage is in the facility with w ich the sand can be supplied to the grinding machine with a varymg quantity of water to suit that part of the process where a certain ade of sand is being applied. At times it is necessary to supply the sand with an extremely diminished quantity of water, and while this h s been found impractical with other apparatus, owing to the difiiculty in carrying the sandywith the small quantity of water, assiat. the operation by means of the. accompan'ylng air current supply.

-The advantages of t einvention will be readily appreciated by all those familiar with this class of apparatus. It is comparatively simple, direct, economical, and not liable to breakage or derangement, while being capable of a very accurate adjustment and control. It will be understood that the number of the several compartments, the pumps and their connections, and the design, proportions, or other details of the invention may be changed or modified by the builder or skilled mechanic, but that all such changes are to be considered as within the scope of the following claimsv What I claim is:

L Apparatus for delivering abrasive ma terial consisting of a r'climinary collecting tank, a separate classi ying'tank, means for removing abrasive and water from the preliminary tank to the classifyin tank, and means for removing abrasive an water from the classifying tank and supplying it to a utilizing apparatus.

2. Apparatus for delivering abrasive material consisting of a preliminary collecting tank, a separate classifying tank, means for removing abrasive and water from the lower portion of the preliminary tank to the upper portion of the classifying tank, and means for removing abrasive and water from the classifying tank and supplying it to a utilizing apparatus.

3. Apparatus for delivering abrasive material consisting of a preliminary collecting tank, a separate classifying tank having a series of partitions providing settling com.- partments of varying heights communicating above the partitions, means for removing abrasive and water from the lower portion of the preliminary tank to the, upper portion of the classifying tank, and means for removing abrasive and water from each settling compartment and supplying it to a utilizing apparatus.

4. In apparatus for collecting and delivering abrasive material, the combination of a preliminary collecting tank, a classifying tank having settling compartments and an overflow conduit, means for removing abrasive and water from the preliminary tank to the classifying tank, and a series of air lift pumps for removing the abrasive and water from the settling co artments.

5. In a paratus for collectiilg and delivering a rasive material, the combination of a preliminary collecting tank, a classifying tank having settling compartments and an overflow-conduit, a return overflow conduit connecting the up r portion of the classifying tank with t e collecting tank, means for removing abrasive and water from the preliminary tank to the classifying tank, and a series of air lift pumps foiareof a preliminary colleciin tanh p; with a downwardly extem ing part5. on M. its upper portion, a supply conduit opening to the upper part of the tank at one side of said partition. an overflow conduit leading from the tank at the other side of said partition, settling and classifying tank, means for removing abrasive and Water from the (TOlltClUigf tank to the classifying tank. and on we ow mmrloit loading from the upper porti n of t e settling tank to the coilo t og tank.

7. In apparatus ifmcolic-cling and delivering filllllFi t' ninrcrizi the combination with n settling and missifying clminlwn of :1 pump lOOalPil in u': lower portion Oi said chamber having it conduit pr vided" with :1 delivery pipo and a pipe tensi n above the connectimi tlurcn'ith hiwnig on air escape controlling vnlvc. substantially as set forth.

8. Apparatus for clo. sifying and segregating abrasive mutt-rial cons ting of a tank having a downwardly extending par tition at one end, :1 plurality of in. 'Poting and settling compartments flii' d if; pf/i!" titions of varying height, means .i 1' supplying :ilnasivo tlll'i i nior lwtnvron d wn \vtirdly encoding partition and r 0nd of the tank to the tint of said (:I!i]3fii'tl'fl -Ili&

an ovorllmv Londnit :it the other end oi tho tank. and it rrits of pumps located in the loncr porli m--z w'l? rho folio-ting and settling compartments and lflltlplfiil to deliver inntcrial to utilizing nioolianism,

(l. Apparatus-,4 for classifying and segrzgating abrasive material consisting of a tanl; having: :1 dmvnmirdly extending par tit ion il one roll, a plurzilitv of soli iting nd ttli g mmipnrtnmnts divided by pertitions of varying lirig'ni mom; for sooply ing abrasive anti L \vardly extending .nriiih the tank to the first of said conipnrtn'mnrs, an overflow conduit at the othor 0nd of thc tanln a series of pumps loo; ed in the lower portions of the collecting and settling com partments conduits tlmrct'rom provided at their upper ends with air oscziptcontrolling vulvcs, and a common delivery pipe con nected with said conduits below snu' valves and adapted to deliver material to utillzmg mechanism,

10. Apparatus for classifying abrasive material comprising a tank having a serles of vertical .partitions extending upwardly from its bottom forming settling comparh mcnts, a partitioxpextending downwardly to the upper portion of the first settling oom partmr-nt, a collecting tank, means for supplying water and abrasive therefrom to one side of the downwardly extending partition and for taking nil ih side thorcoF, means fo overflow from the settling looting tank, and a fixedly 3 each of said settling :2 v to rem e nhmsive fl 4 any g compartment to a, utilizing mat:

11. In ooxnhinatinn, a settling H; a, series of upwardly extending pat-t lt f increasing height, providing compartments, a collectio ton therein connected with wi l or liver into the upper por zon tank, a sewer, an overflow oomiimf t on settling tank to the sewer, an ov V the settling rank hack to tho 0 a glass grinding machine llriVl leading to the collecting tank, 1 in (-Ettfill settling tank having dolly-ivy leading to the grinding mm 12. Apparatus for tiles. material comprisin a, tool h of graduated porter, from its bottom fr merits, means or i1 abrasive into the t coco urnvnrdl ri v area of the Link await: 4 muons, and an overflow modul tet'oinorl area leading from in iio ii the 15. Apparatus I nmteriol compri :1- tatilc lieu of graduated pa; is extra p from its bottom forming out n merits: means for effecli :5 liw in. abrasive into the first, (L'eTYlEmli' i; thence upwardly tlirongh l cross area, of the iz'lfik titions, llfi o erflow mined area leading fr; or the tank, and an add dnit for surplus Water .1? said overflow conduit.

ll, The con'ihination xvi ing al'lrasive and water, of I l m; :i bodily incorporated downwardly Y agitating water supply and c ntro moans therefor, substantially as sot fwriiii.

15. The cbmbination with a. tank contour in abrasive and water. of a pump lmvirw a odily incorporated downwardly dircctcil agitatin water supply and controlling means t erefor, and a regulable actuating air supply, substantially as set forth.

In testimony whereof I hereunto affix my signature in the presence of two witnesses.

I C. M. CLARKE, F REDK. S'IAUB.

F1 b g; i-ll l 

